Automatic felt washer for paper machines



J. D. KASTER AUTOMATIC FELT v'f'AS-{ER FOR PAPER MACHINES Feb. 21, 1933Feb. 2, 1933. J. D. KASTER AUTOMATIC FELT WASHER FOR PAPER MACHINES FildJune 3o. 1931 2 sheets-sheet 2 g-nuenko'o utenze/13 Patented Feb. 21,1933 r iJNlTEo sfrA'lil'isA "PATENT JOSEPH D. xAsTEn, or SALEM, OREGON,AssiGNoRTo OREGON 'PULP AND PAEEE coMPANnoFsALEM, ois-EGON AUTOMATICFELT WASHER FORYPAPER MACHINES .Application tiled 'J' une v30,

My present invention .has Areference to improvements in meansforau-tomatically washing the felts of paper making machines, and moreparticularly it is my purpose to provide a felt washer which willautomatically move across the under surface of a felt while it is inoperation on a paper making machine, to remove dirt, scraps of paperstock, and iine particles. Conventional paper making machines, now inuse, take up `the particles of paper stock upon an endless moving felt;`

that is, the newly made wet paper sheet is supported by the felt whichin turn passes between two heavy press rolls, the purpose :of which isAto squeeze the water out of the paper. In operation, the water issqueezed out of the paper and through the felt which, in the course of avery few hours, becomes .dirty and matted with fine particles Aof paperstock. It is practice in the paper industry to run Apaper makingmachinescontinuously for more than one shift and it .is a very.diiiicult and complicated operation to .stop or shut down .a papermaking machine so long as stockis being fed toit from the beaters.Accordingly, when a felt becomes dirty and it is necessary to shut downor stop the paper making machine, there is a serious Aloss inproduction.

My present invention contemplates "the utilization of a suction `box orchamber which is movably supported on tracks beneath .the endless feltso.that thefelt will just rub across the top of the box or chamber. Thesuction .box is provided with suction holes, and

ahead ofeach section hole .a stream of water is forced against the felt.and which is subsequently sucked out lof the felt through the suctionopenings, thereby cleaning the vfelt of any particles of paper :stock ordirt that may be accumulated thereon. In order to prevent cleaning thefelt in 4streaks `or spots only, my invention contemplates slowly andcontinuously moving the suction box back and forth beneath the felt asit passes over the suction box, so that the entire felt is cleaned. Itis understood that the openation of my suction cleaning apparatus iscontinuous throughout the whole time that the paper making machine is inoperation so that the felt is automatically kept in a clean conditionand, it is 1931. seria1No.547,96s. y

never necessary to: shut down .the papermaking machine.

Paper making -Vmachines l consume avast quantity Vof water, which iszlargely under pressure, and for that reason my automatic .Y

felt washer is hydraulicallyv actuated andre.-v

versed, and the number of'working parts is reducedv toa minimum so thatthe possibility of its becoming out of order or inoperative is `largelyeliminated kand repairsmay be quickly and easily executed. `Y

While in theforegoing some of the principal objects and advantages `ofmy invention vhave' been pointed out, it is understood that 4Gti i Inthe drawings wherein the, preferred y' formof my invention isillustrated v Figure lis a plan View of my automatic felt washerassembly. l'. y. g

AFigure 2 is an .end view thereof, and l Figure 3 is a side elevationthereof.

In the vdrawings wherein like characters ofreferencev are .used todesignate likeor similar parts throughout the several views :f i

rlhe numeral (l) designates my suction box which may be of yany suitableconstruction, andis slidingly supported on rails (2 and 3) or guides,beneath the endless felt, (not shown)of a conventional paper makingmavvchine so that the felt passes over andin contact with the top of.the box. The suction box (l) is disposed transversely with respect tothe felt (not shown). and-is of considerably less width than the felt(preferably about 26 .inches shorter) The suction box has two (or more)suction holes (therein and there is a vshower 'pipe' (5) in advance ofthe box for forcing a stream of water against the felt as itpasses overthe box, which is then sucked out of the felt, takingaccumulated dirt,waste and line particles of paper stock with it.

The suction box has a suitable connection (6) at one side. with thepiston'rod (7) of a hydraulic power assembly The piston rod (7) passesthrough a stuffing Abox into thecylinder (10) into connection with adouble-action piston assembly (not shown) there- The suction box alsohas connected therewith a reversing rod (11) which slides in guides (12)and has connection with a lever (12a) connected with the four way valve(13) of the hydraulic reversing cylinder assembly 14). Water underpressure, or other suitable means (such for instance as compressed airor the like) is fed throughpipe. (15) into branch` connections (16) and(17), one tothe hydraulic power assembly (18) and the other to thehydraulic reversingmechanism (111);

The hydraulic power assembly (8) has a four way operating valve (18)into which the pipe (17) leads, and which is connected with branch pipes(19) and (20) 'leading to the two heads Vof cylinder (10). j

The hydraulic reversing mechanism (14) also has a four-way valve (13)into which actuates the pistons therein (not shown) to move the pistonrod (2a) back to draw the lever (25) connected therewith back'to throw'valve (18) to shut olf water from pipe (20,)

and admit water to pipe (19) to move the piston in the hydraulic powercylinder andits rod (7 forwardly and consequently to move the suctionbox (1)VV forwardly.4 The operation Vof my invention is accordinglyautomatic in'every respect, and automatically reversing, to'move thesuction b ox (1) back and forth beneath the felt so that the entiresurfaceof the felt as it passes overthe box is acted upon to completely,automatically, and continuously cleanse the same. L

The cylinder, (10) and the cylinder [(28) are Asuitably mountedinsupports (26) and (27), there is a suction hose connection (28) on thesuction box for attaching a suitablejflexible suction hose (not shown).vThere are also suitable supports (not shown) for thev guide rails (2and 8). The views of the drawings are designed to show the operativefeaturesof the present invention without including the well-knownconstruction ,of paperv making machines, felts, supports, and the like.

From the foregoing, it is believed, that the construction operation andadvantages :of

- my'invention will be apparent, but since some changes in detail may bedesirable inthe detailed parts of its organization, it is againemphasized that interpretation thereof should only be conclusive whenmade in the S light of the subjoined claims.

I claim:

1. In combination with a paper making machine of the type having acontinuous, moving felt carrying the wet paper stock, a washer for thefelt comprising a suction box located beneath and in Contact with thefelt .and having spray means in conjunction therewith, a hydraulicpiston assembly, the pistonrod of which is connected with the suctionbox toA move the same beneath the felt, and hydraulic reversingmechanism for the piston assembly andactuated by movement of the suctionVbox for controlling said pis- 'ton assembly to give a reciprocatingmotion piston assembly, and actuated by movement of thel suction boxfor-controlling said piston assembly to give a reciprocating motion tothe suction box there being a pair of associated four-way valve 4devicesin conjunction therewith; v l

Y 3. In combination with apaper making machine of the type having acontinuous moving felt carrying the wet paper stock; a washer for thefeltY comprising a water spray pipe extending transversely of the feltand beneath the same, a suction box located adjacent said spray pipe andextending transversely of the felt, beneath and in contact with thefelt; vsaid suction box having suction openings therein and having alength less than the width of the felt; a frame carrying the suctionbox; a hydraulic double acting piston assembly, the piston Vrod beingconnected with the suction box to move the same beneath the felt, andhydraulic revers- Ving mechanism for the piston assembly including anactuating rod connected to the suction box to be controlled by themovement of the suction box; a common fluid pressure supply pipe havingbranches to the piston Yassembly and they reversing mechanism, and fourway valves, one for the piston assembly and one for the reversingmechanism, said valves controlling the introduction of fluid underpressure thereto. g Y

In testimony whereof I aflix my signature hereunto. Y JOSEPH D. KAS'IER.

